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Gabbro is a dark-colored coarse-grained intrusive igneous rock. The specimen shown above is about two inches (five centimeters) across. Gabbro is a coarse-grained, dark-colored, intrusive igneous rock. It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite. It is the most abundant rock in the deep oceanic crust. Gabbro has a variety of uses in the construction industry.
Basalt is an extrusive igneous rock used in constructing buildings and statues. Extrusive rocks are also referred as volcanic rocks because volcanoes are important in their formation. When magma cools and hardens below the Earth's surface, an intrusive igneous rock forms. Because the process of the formation of intrusive igneous rock occurs slowly, these rocks tend to have a grainy texture. Examples of intrusive igneous rock include granite and gabbro. Granite is an intrusive igneous rock used as for making gravestones, statues, and countertops because it is very durable. Gabbro is an intrusive igneous rock that often contains profitable amounts of gold, chromium, and silver.